Lithium ion battery EIS low-frequency-band online measurement method based on step waves

A technology of lithium-ion battery and measurement method, which is applied in the field of rapid measurement of battery impedance, can solve the problem of inability to realize low-frequency online high-precision measurement of lithium-ion battery EIS, and achieves the effect of high precision and reduction of calculation errors.

Active Publication Date: 2021-06-01
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0004] In view of the defects existing in the prior art, the object of the present invention is to provide an online high-precision measurement method for lithium-ion battery EIS in the low-frequency band based on the ladder wave, which can improve the existing technology that cannot realize the low-frequency band of lithium-ion battery EIS in engineering. On-line high-precision measurement and sinusoidal current test EIS and other issues

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  • Lithium ion battery EIS low-frequency-band online measurement method based on step waves
  • Lithium ion battery EIS low-frequency-band online measurement method based on step waves
  • Lithium ion battery EIS low-frequency-band online measurement method based on step waves

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] Such as figure 1 As shown, a kind of lithium-ion battery EIS low-frequency online measurement method based on the step wave of the present invention comprises the following steps:

[0045] S1. According to the formula (1), the sine wave current required for the electrochemical impedance spectroscopy test is equivalent to a step wave current, and the step number N corresponding to the step wave current of a cycle sine wave current is determined,

[0046] the y n =Asin((n-1)H+H / 2) (1)

[0047] Among them, y n Indicates the current amplitude of the nth step, A indicates the current amplitude of the electrochemical impedance spectroscopy test, n=1,2,3,...,N, indicates the number of steps in the step wave current, N indicates the number of steps, H is calculated by formula (2),

[0048] H=2π / N (2)

[0049] S2. According to the sine wave current amplit...

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Abstract

The invention belongs to the technical field of rapid measurement of battery impedance, and relates to a lithium ion battery EIS low-frequency-band online measurement method based on step waves. The method comprises the following steps of: determining a proper step wave step number and a current amplitude based on electrochemical reaction characteristics of a lithium ion battery and actual requirements; applying step wave current in a proper frequency range to the lithium ion battery, performing sine fitting on the sampled step wave current and response voltage to obtain an impedance value of a required low-frequency band, and then forming a low-frequency-band electrochemical impedance spectrum, namely a low-frequency-band EIS, of the lithium ion battery. According to the low-frequency-band EIS online measurement method, the low-frequency-band impedance information of the lithium ion battery can be accurately reflected; the method has the effects that the low-frequency EIS test result of the lithium ion battery is high in precision, engineering is easy to realize and the like, and effective technical support is provided for rapid evaluation and safety early warning of the health state of the battery.

Description

technical field [0001] The invention belongs to the technical field of rapid measurement of battery impedance, and relates to a step wave-based lithium-ion battery EIS (electrochemical impedance spectroscopy, Electrochemical Impedance Spectroscopy) low-frequency on-line measurement method, in particular to a step-wave-based lithium-ion battery EIS low Frequency band online high-precision measurement method. Background technique [0002] The performance testing, status evaluation and safety warning of lithium-ion batteries have always been the key issues that need to be solved during the use of lithium-ion batteries. However, in actual use, due to the complex operating conditions and limited test data of lithium-ion batteries, it is difficult to accurately judge The status of lithium-ion batteries, evaluating the performance of lithium-ion batteries. In laboratory research, it is found that by analyzing the low-frequency band data of electrochemical impedance spectroscopy, m...

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Application Information

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IPC IPC(8): G01R31/389G01R31/378G01R27/02
CPCG01R31/389G01R31/378G01R27/02
Inventor 孙丙香王家驹苏晓佳张维戈何锡添吴健张言茹周兴振
Owner BEIJING JIAOTONG UNIV
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